o During ZipKieModule loading in “org.drools.compiler.kie.builder.impl.ZipKieModule:142” nullpointerexception is thrown:

urlPath = urlPath.substring( urlPath.lastIndexOf( '!' ) + 1 );

ArrayList<ZipEntry> entries = new ArrayList<>();

// read jar file from uber-jar

InputStream in = this.getClass().getResourceAsStream(urlPath); // nullpointerexception

For example full UrlPath on windows to internal .jar is:

C:\Users\xbbnv0c\IdeaProjects\ais-data-exchange\data-exchange-app\target\data-exchange-app-1.0.1-SNAPSHOT.jar!\BOOT-INF\lib\data-exchange-brms-1.0.1-SNAPSHOT.jar

So the result of this first line will be:

\BOOT-INF\lib\data-exchange-brms-1.0.1-SNAPSHOT.jar

It will be perfect, but during accessing internal resource file separator should be “/” not “\”. So InputStream in = null.